With excellent shape memory effect（SME） and super-elastic（SE）, nitinol shape memory alloy（NiTi SMA） was widely used in the fields of aerospace, artificial intelligence and biomedicine, etc. To control costs, and obtain multi-functional components or exploit novel products, as an essential method, dissimilar welding of NiTi SMA/Ti6Al4V alloys was concerned. The key problems in welding of NiTi SMA/Ti6Al4V were reviewed. The research progress in fusion welding, diffusion welding and brazing methods was summarized, and the effects of different welding methods on welding results were compared. Diminishing the brittle intermetallic compounds in NiTi SMA/Ti6Al4V interface was the key factor to affect the mechanical properties of joints. One useful way to inhibit intermetallic compounds in interface of NiTi SMA/Ti6Al4V joints was addition middle layer as a barrier.